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Theoretical and Experimental Investigation of Cold Roll Welding for Production of Aluminum Clad Steel Sheet

Danesh Manesh, Habib | 2004

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 34732 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Karimi Taheri, Ali
  7. Abstract:
  8. Aluminum coated steel sheet is an excellent composite material in which; the strength and economy of steel and durability of aluminum are combined. This material is produced by several methods. However, there are two main technologies to produce aluminized steel sheets: 1) the hot dip method and 2) the aluminum clad method (cold roll welding process). The hot dip method is most widely used for producing the aluminum coated steel. The aluminum coated steel sheet manufactured by this method is believed to be inferior to an aluminum sheet with respect to surface appearance, corrosion resistance and formability of the coated metal. Consequently, the aluminum clad steel method is one of the most desirable means of aluminum coating, since it increases the corrosion resistance and improves the formability of the surface layer. In this investigation, the cold roll welding process for production of aluminum coated steel sheets is assessed in four steps. In the first step the mechanisms of cold roll welding of aluminum to steel sheet is investigated using a study of interfacial behavior during rolling as well as the surface characteristics of peeled aluminum clad steel sheets. Then in the second step the effects of the mechanical and the metallurgical parameters are investigated on the bond strength of Al clad steel sheets, employing theoretical (upper bound theory) and experimental methods. Furthermore, for the first time the new parameter named the length of welding is defined to create the relationship between the mechanical and the metallurgical parameters of process and prediction the quality of bond strength of tri-layer strips of Aluminum/ Steel/ Aluminum produced by this method. A roll bonded and work-hardened strip composite should be heat treated in order to obtain a composite of high formability. Therefore, in the third step of this investigation the effect of time and temperature of annealing treatment is evaluated on the mechanical, the formability and the bond strength of aluminum clad steel sheets to achieve the best annealing time and temperature for these sheets. Finally, in the fourth step using an Electrical Resistivity test a new non-destructive method is proposed for assessing the quality of bonding between the aluminum and steel sheet produced by cold roll welding process
  9. Keywords:
  10. Cold Roll Welding ; Cladding ; Aluminum Clad Steel Sheet ; Specific Electrical Resistivity ; Cladding

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